# RxSwift Reactive Programming with Swift

**Repository Path**: Sven001/RxSwift-Reactive-Programming-with-Swift

## Basic Information

- **Project Name**: RxSwift Reactive Programming with Swift
- **Description**: RxSwift Reactive Programming with Swift 书籍及源码
- **Primary Language**: Swift
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 1
- **Created**: 2020-01-06
- **Last Updated**: 2023-04-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

RxSwift Reactive Programming with Swift 书籍及源码

### 环境
Swift 4.2 
Xcode 10.1
RxSwift 4.4

## ViewModel建议规范
mvvm架构示意图

![View-ViewModel-Model架构](https://images.gitee.com/uploads/images/2020/0106/165109_9f95eced_2164933.png "屏幕快照 2020-01-06 下午4.50.05.png")

View Model设计原则
![ViewModel建立](https://images.gitee.com/uploads/images/2020/0106/165330_f9f4081e_2164933.png "屏幕快照 2020-01-06 下午4.52.38.png")

ViewModel只是屏幕界面的数据映射和逻辑大脑，但是不应该把网络请求，导航，缓存等统一放在里面。

ViewModel应该包括，
1. init(输入输出绑定)
2. input 属性
3. output 属性

示例：
```swift
class ListPeopleViewModel {

  private let bag = DisposeBag()

  let list: ListIdentifier
  let apiType: TwitterAPIProtocol.Type

  // MARK: - Input
  let account: Driver<TwitterAccount.AccountStatus>

  // MARK: - Output
  let people = BehaviorRelay<[User]?>(value: nil)

  // MARK: - Init
  init(account: Driver<TwitterAccount.AccountStatus>,
       list: ListIdentifier,
       apiType: TwitterAPIProtocol.Type = TwitterAPI.self) {

    self.account = account
    self.list = list
    self.apiType = apiType

    bindOutput()
  }

  func bindOutput() {
    //observe the current account status
    let currentAccount = account
      .filter { account in
        switch account {
        case .authorized: return true
        default: return false
        }
      }
      .map { account -> AccessToken in
        switch account {
        case .authorized(let acaccount):
          return acaccount
        default: fatalError()
        }
      }
      .distinctUntilChanged()

    //fetch list members
    currentAccount.asObservable()
      .flatMapLatest(apiType.members(of: list))
      .map { users in
        return (try? unbox(dictionaries: users, allowInvalidElements: true) as [User]) ?? []
      }
      .bind(to: people)
      .disposed(by: bag)
  }
}
```